81441345 has 8 divisors (see below), whose sum is σ = 130306176. Its totient is φ = 43435376.

The previous prime is 81441313. The next prime is 81441361. The reversal of 81441345 is 54314418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81441345 - 2⁵ = 81441313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2714697 + ... + 2714726.

It is an arithmetic number, because the mean of its divisors is an integer number (16288272).

Almost surely, 2^81441345 is an apocalyptic number.

It is an amenable number.

81441345 is a deficient number, since it is larger than the sum of its proper divisors (48864831).

81441345 is a wasteful number, since it uses less digits than its factorization.

81441345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5429431.

The product of its digits is 7680, while the sum is 30.

The square root of 81441345 is about 9024.4858579312. The cubic root of 81441345 is about 433.4592871865.

The spelling of 81441345 in words is "eighty-one million, four hundred forty-one thousand, three hundred forty-five".